2×16

2×16 commonly denotes a two-line by sixteen-character alphanumeric LCD display module. In electronics and embedded systems, a 2×16 LCD is a small text display used to present plain information. The term 2×16, and its variant 16×2, describe the geometry: two horizontal lines, each capable of displaying sixteen characters. Each character is typically formed by a 5x8 dot matrix.

Most 2×16 modules are HD44780-compatible or compatible with modern controllers. They provide a parallel interface with either eight data lines (D0–D7) and three control lines, or a reduced four-bit data bus using D4–D7 with the remaining lines shared. Commands allow clearing the display, returning home, setting the cursor, and writing characters. The display is addressed via DDRAM and CGRAM addresses. They are usually powered from 5V, with a separate backlight LED that consumes additional current. Contrast is adjusted via a potentiometer on the module connected to the Vo pin.

Typical modules include a 16-pin connector: Vss, Vdd, Vo, RS, RW, E, D0–D7 or D4–D7, and LED+ and LED- for backlight. In 4-bit mode, only D4–D7 are used; in 8-bit mode, all eight data lines are used. The displays are popular because they are inexpensive, low power, easy to program, and support basic text output; they are widely used in hobby projects and various consumer devices.

Other uses of the notation 2×16 may appear in memory or display specifications, but the exact meaning depends on the device and documentation. In practice, 2×16 most often refers to two lines of sixteen characters each on an alphanumeric LCD.